build(deps): update dependency angular-gridster2 to v15 (latest)

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
angular-gridster2 (source)	dependencies	major	14.0.1 -> 15.0.0

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Release Notes

tiberiuzuld/angular-gridster2

v15.0.0: 15.0.0 (2022-11-26)

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Support for Angular 15

• Migrate library to standalone components and keeping the GridsterModule support
• Migrate Demo App to standalone components
• Update README.md to have example with standalone components

v14.1.2: 14.1.2 (2022-10-17)

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Bug fixes

• fix: merge resizableHandles property using spread operator to fix the first override applying to all items in the grid #​841 Thanks @​mfjharvey
• fix: add rxjs as peer dependency #​839

v14.1.1: 14.1.1 (2022-08-11)

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Bug Fixes

• fix for the most bottom/right item being stuck. #​828 Thanks @​polhek
• fix dropOverItemsCallback when you return to the cell from which you left, #​829 Thanks @​kryshac

v14.1.0: 14.1.0 (2022-07-14)

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Features

• feat: extend gridster item configuration with resizable handles #​807 #​821 Thanks @​dogukan10

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